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Nano silicasol / acrylic ester composite emulsion and preparation thereof

A nano-silica sol, acrylate technology, applied in coatings and other directions, can solve the problems of reducing emulsion stability, time-consuming, cumbersome process, etc., and achieve the effect of eliminating modification steps, reducing usage, and low price.

Inactive Publication Date: 2009-08-05
SHANGHAI SUNRISE CHEMISTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This modification method is cumbersome and time-consuming, and the introduction of a silane coupling agent can easily induce crosslinking of the acrylate emulsion during the polymerization process, resulting in agglomeration and scum, reducing the stability of the emulsion

Method used

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  • Nano silicasol / acrylic ester composite emulsion and preparation thereof
  • Nano silicasol / acrylic ester composite emulsion and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take the commercially available acidic nano silica sol (SiO 2 The content is 3 grams, the primary particle size is 20nm, pH=3), 4.5 grams of ethanol are mechanically dispersed in 50 grams of water for 20 minutes at high speed, the dispersed mixed solution is added to the flask and heated to 80°C, and (NH 4 ) 2 S 2 O 8 0.2 g, NaHCO 3 0.2 g, and pre-mix 80 g of butyl acrylate, 60 g of methyl methacrylate, 5 g of methacrylic acid, 2.5 g of sodium lauryl sulfate, and 2.5 g of nonyl phenol polyoxyethylene ether OP-10 emulsifier And 50g of water are mixed and pre-emulsified for 15 minutes to form a monomer pre-emulsified liquid; take 10% of the monomer pre-emulsified liquid dropwise into the flask, control the reaction temperature at 80 ℃, after the reaction proceeds for 30 minutes, drop the remaining monomer pre-emulsified Liquid and initiator ((NH 4 ) 2 S 2 O 8 And buffer NaHCO 3 A solution of 0.8 g and 50 g of water is heated to 85°C for 2 hours after the dripping is completed...

Embodiment 2

[0032]Take commercially available alkaline nano silica sol (SiO 2 The content is 4.5 grams, the primary particle size is 10nm, pH=10.5), 6 grams of propylene glycol, 80 grams of water, 3 grams of sodium lauryl sulfate, nonyl phenol polyoxyethylene ether OP-101.8 grams, and butyl acrylate 60 grams , 80 grams of butyl methacrylate, 4 grams of acrylic acid and 4 grams of hydroxyethyl methacrylate mixed, pre-emulsified for 15 minutes into a pre-emulsified liquid; (NH 4 ) 2 S 2 O 8 1.5 grams, NaHCO 3 1.5 grams and 50 grams of water are used to prepare the initiator and buffer solution; first take 10% of the pre-emulsion solution and add 5% of the initiator and buffer solution dropwise at the same time. After reacting at 80°C for 30 minutes, add the remaining pre-emulsion solution dropwise. Emulsion and initiator and buffer solution are heated to 85°C for 2 hours after dripping. After cooling, ammonia water is added to adjust the pH value to 9, and the material is discharged.

Embodiment 3

[0034] Take commercially available alkaline nano silica sol (SiO 2 The content is 1.2 grams, the primary particle size is 7nm, pH=8), 3 grams of isooctyl alcohol, 50 grams of water, 1.8 grams of sodium lauryl sulfate, nonyl phenol polyoxyethylene ether OP-101.2 grams, ethyl acrylate 30 grams, 30 grams of hexyl acrylate, 25 grams of methyl methacrylate, 10 grams of butyl methacrylate, 3 grams of acrylic acid and 2 grams of methacrylic acid were mixed, pre-emulsified for 15 minutes into a pre-emulsion; K 2 S 2 O 8 0.5 g, NaHCO 3 0.5 g and 30 g of water are used to prepare the initiator and buffer solution; first take 15% of the pre-emulsion solution and add 10% of the initiator and buffer solution dropwise, react at 82°C for 30 minutes, and then add the remaining pre-emulsion solution dropwise The emulsified liquid and the aqueous solution of initiator and buffer are heated to 85°C for 2 hours after the dripping is completed. After cooling, ammonia water is added to adjust the pH va...

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Abstract

The invention discloses a nanometer silica sol / acrylic ester composite latex and a preparation method thereof. The composite latex is formed by polymerizing acrylic ester monomers with nanometer silica sol and alkylol solvent; emulsion particles in the composite latex are in a nanometer nucleus-shell structure taking silicon dioxide granules as nucleus and acrylic ester multipolymer as shells; and the preparation method adopts a seed emulsion polymerization method or in situ polymerization method. The composite latex has higher tensile-strength and tearing strength and better performances of acid durability, weather resisting property, wearing resistance, ultraviolet aging resistance, anti-pollution resistance, and the like, can be applied to various aspects of inner and outer wall dope, ground and terrace dope, ground coating of specialty sports fields, and the like, is green and environment-friendly, and has wide market foreground.

Description

Technical field [0001] The invention relates to a composite emulsion used in industries such as interior and exterior wall coatings, ground floor coatings, and professional sports ground floor coatings and a preparation method thereof, in particular to a nano silica sol / acrylate composite emulsion and a preparation method thereof. Background technique [0002] Acrylate emulsion refers to a polymer emulsion obtained by polymerization of esters of acrylic acid and its homologues. It has excellent film-forming properties, adhesion properties and weather resistance. It can be widely used in construction, textiles, and adhesives. , Papermaking and other industries. [0003] Acrylic emulsion is used in the construction industry for interior and exterior wall coatings, floor coatings and professional sports ground floor coatings. It has excellent stain resistance, weather resistance, and thermal insulation properties. However, due to poor water resistance of acrylate emulsions, it is ea...

Claims

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Application Information

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IPC IPC(8): C08L33/08C08L33/14C08L33/02C08K3/34C08F2/24C08F2/44C09D133/02C09D133/08C09D133/14
Inventor 王非傅乐峰郑柏存
Owner SHANGHAI SUNRISE CHEMISTRY CO LTD
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